they can lose privileges, lose their phone, lose tv time. you can start with grounding. they can't go to the play date because they were mean to their sibling. >> you know, people will be sitting here watching this and they'll say, spanking worked on me. you know, i certainly want to spank my kids. >> it's a really, really tough question. the thing about spanking is, again, like punishment, it doesn't teach anything few. it's not going to give new information and can teach them to be aggressive so you want to keep that to a minimum. >> 13 and up quickly? >> 13 and up, negotiate on rules, don't be their friend. we've talked about that before. you want to make it time-limited, very specific punishment that fits their behavior. >> right. >> it's hard. discipline is hard. >> i think taking away the electronics is probably going to be one of the big things. >> loss of screen time, tv, computer, phone, all of it. >> dr. jennifer hartstein, as always, thank you. for more "eye on parenting" content, all you need to do, including blogs and all kinds of other good stuff, go to our website, earlyshow.cbsnews.com.